必贏的剪刀石頭布程式:
#include<iostream>
#include<cstdlib>
using namespace std;
main()
{
int i;
cout<<"1>剪刀，2>石頭，3>布\n" ;
cin>>i;
switch(i)
{
case 1:
cout<<"我出石頭";
break;
case 2:
cout<<"我出布";
break;
case 3:
    cout<<"我出剪刀";
    break;
}
cout<<"，我贏了\n";
system("pause");
}

輸入一元二次方程式ax2+bx+c=0之係數a,b,c電腦將判斷有無實根:
#include<iostream>
#include<cstdlib>
using namespace std;
main()
{
int a,b,c;
cout<<"請輸入一元二次方程式之係數a,b,c電腦將判斷有無實根";
cin>>a;
cin>>b;
cin>>c;
if(b*b-4*a*c>=0)
cout<<"有實根\n";
else
cout<<"無實根\n";
system("pause");
}